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Cosmogrid Cosmogrid

STERNE/SPECTRUM model grids

C.S.Jeffery 2000 - 2005

Introduction

Grids of model atmospheres and synthetic spectra, including the model structure, broadband flux distribution, emergent spectrum, continuum and normalized spectrum within selected wavelength intervals, computed with the LTE model atmosphere code Sterne and the formal solution code Spectrum.

Details of models in each grid are given in separate files. Abundances are given as relative abundances by number. The abundance of the dominant chemical species is nominal, being effectively (1 - Sum_i.n_i).

Grids are generated using a Condor Cluster at the Armagh Observatory. Grid Tools for submitting jobs, checking results and generating the index files attached are provided for local users.

There are currently nearly 4000 separate model atmospheres in these grids, and, including the hires spectra, over 12000 separate files. Many of these are in gzipped format. We plan to make gzipped tarballs of selected models available in due course. We also plan to enable web users to plot a given spectrum, or section thereof, online.

Convergence. Models are considered to have fully converged when all flux errors are < 0.5% and all temperature corrections are < 1K. In general, problems with flux errors > 1% or temperature corrections > 1K near the upper or lower boundaries are not considered fatal. Users should, however, be wary of models which show flux errors > 0.3% in the line forming region. This indicates an error in the temperature stratification and may lead to errors in the formal solution. A more extended discussion of convergence issues will be given elsewhere.

Any use of these model spectra should cite:
C.S.Jeffery, V.M.Woolf, D.L.Pollacco, 2001. A&A 376, 497

Recent models have been computed using Beehive, the Armagh Computer Cluster which acts as the Armagh node of Cosmogrid.

Model Grids

Grid
label 		H He [Fe/H] odf C N O Sterne
version		 Spectrum
version		 Number
of models
H+He
 coarse
h00he100 0.001 0.999 0.0 he90 [0.0] [0.0] [0.0] 2.6 3.0 216
h01he99 0.01 0.99 0.0 he90 [0.0] [0.0] [0.0] 2.6 3.0 251
h05he95 0.05 0.95 0.0 he90 [0.0] [0.0] [0.0] 2.6 3.0 245
h10he90 0.10 0.90 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 225
h30he70 0.30 0.70 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 227
h50he50 0.50 0.50 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 217
h70he30 0.70 0.30 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 201
h90he10 0.90 0.10 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 204
h95he05 0.95 0.05 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 201
h99he01 0.99 0.01 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6 3.0 200
h100he00 0.999 0.001 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6 3.0 200
H+He (2)
 sdB
h100hem5p00 0.99999 0.00001 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 80
h100hem4p00 0.9999 0.0001 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 80
h100he00p00 0.999 0.001 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 80
h99he01p00 0.99 0.01 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 80
h95he05p00 0.95 0.05 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 80
h90he10p00 0.90 0.10 0.0 p00 [0.0] [0.0] [0.0] 2.6d 3.0a 285
h70he30p00 0.70 0.30 0.0 p00 [0.0] [0.0] [0.0] 2.6 3.0 191
h50he50p00 0.50 0.50 0.0 p00 [0.0] [0.0] [0.0] 2.6 3.0 186
h100hem5m10 0.99999 0.00001 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 79
h100hem4m10 0.9999 0.0001 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 79
h100he00m10 0.999 0.001 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 79
h99he01m10 0.99 0.01 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 78
h95he05m10 0.95 0.05 -1.0 m100 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 77
h90he10m10 0.90 0.10 -1.0 m10 [-1.0] [-1.0] [-1.0] 2.6d 3.0a 79
h100hem5m20 0.99999 0.00001 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 79
h100hem4m20 0.9999 0.0001 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 79
h100he00m20 0.999 0.001 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 79
h99he01m20 0.99 0.01 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 74
h95he05m20 0.95 0.05 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 71
h90he10m20 0.90 0.10 -2.0 m20 [-2.0] [-2.0] [-2.0] 2.6d 3.0a 76
He+N
 HdB
h00he99n001 0.0001 0.99 0.0 he90 [0.0] 0.001 [0.0] 2.6 3.0 102
h00he99n003 0.0001 0.99 0.0 he90 [0.0] 0.003 [0.0] 2.6 3.0 102
h00he99n010 0.0001 0.99 0.0 he90 [0.0] 0.010 [0.0] 2.6 3.0 102
He+C
 coarse
h00he99c001 0.0001 0.99 0.0 he90 0.001 [0.0] [0.0] 2.6 3.0 247
h00he99c003 0.0001 0.99 0.0 he90 0.003 [0.0] [0.0] 2.6 3.0 256
h00he99c010 0.0001 0.99 0.0 he90 0.01 [0.0] [0.0] 2.6 3.0 242
h00he97c030 0.0001 0.97 0.0 he90 0.03 [0.0] [0.0] 2.6 3.0 211
h00he95c050 0.0001 0.95 0.0 he90 0.05 [0.0] [0.0] 2.6 3.0 205
h00he90c100 0.0001 0.90 0.0 he90 0.10 [0.0] [0.0] 2.6 3.0 206
He+C+H -
under revision
h01he96c030 0.01 0.96 0.0 he90 0.03 [0.0] [0.0]
h01he89c100 0.01 0.89 0.0 he90 0.10 [0.0] [0.0]
h05he92c030 0.05 0.92 0.0 he90 0.03 [0.0] [0.0]
h05he85c100 0.05 0.85 0.0 he90 0.10 [0.0] [0.0]


H+He+C
 sdB:fine
h89he10c010
 0.89 0.10 0.0 p00 0.01 [0.0] [0.0] 56
h87he10c030 0.87 0.10 0.0 p00 0.03 [0.0] [0.0] 53
h85he10c050 0.85 0.10 0.0 p00 0.05 [0.0] [0.0] 50
h79he20c010 0.79 0.20 0.0 p00 0.01 [0.0] [0.0] 56
h77he20c030 0.77 0.20 0.0 p00 0.03 [0.0] [0.0] 56
h75he20c050 0.75 0.20 0.0 p00 0.05 [0.0] [0.0] 47
h69he30c010 0.69 0.30 0.0 p00 0.01 [0.0] [0.0] 56
h67he30c030 0.67 0.30 0.0 p00 0.03 [0.0] [0.0] 56
h65he30c050 0.65 0.30 0.0 p00 0.05 [0.0] [0.0] 50

Key to available files

X model did not converge: summary given if available
Q converged model summary
q model structure
s flux distribution
f plot of flux distribution
vis visible high-res spectrum (3800A - 7000A)
vis_n visible high-res spectrum (normalized)
blu blue high-res spectrum (3800A - 5200A)
blu_n blue high-res spectrum (normalized)
r red high-res spectrum (6000A - 7000A)
rn red high-res spectrum (normalized)
i near-IR high-res spectrum (8400A - 8800A)
in near-IR high-res spectrum (normalized)
p plot of high-resolution blue spectrum

Sample Spectra

A comparison of spectra as a function of H/He abundance

A comparison of part of the high-resolution spectra computed for models with Teff=35000 K and log g=5.0. The H:He ratio runs from 0:100 at the bottom to 100:0 at the top, corresponding to the grid sequence h00he100 to h100he00. See above for the corresponding metal abundances used.

This page is maintained by:
Simon Jeffery (csj_at_arm.ac.uk)
Last modified: 2007 July 10

Simon's home page